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  #1  
Old 09-22-2008, 03:59 PM
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300SDL Clicking

My 87 300SDL makes a clicking i haven't noticed before when idling... It comes and goes... and is coming from the engine...

Anybody know what this is?
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  #2  
Old 09-22-2008, 04:12 PM
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random clicking before reaching full operating temp is usually metal expanding.

continuous, repetitive, predictable clicking is mechanical and can be numerous things.

please be more descriptive
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  #3  
Old 09-22-2008, 04:15 PM
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Draining the car on my five minute ride to school, stop and am idling for a few mins turning off the radio etc...

clicking starts and sounds to be in-sync with engines normal chatter..
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  #4  
Old 09-22-2008, 05:12 PM
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On some, it is the lifters telling you it's time for an oil change.
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  #5  
Old 09-22-2008, 07:28 PM
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Its the lifters. Try some synthetic that usualy helps them.
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  #6  
Old 09-22-2008, 08:12 PM
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Probably the lifters but put an ear up near the Vacuum pump to see if thats the source of the noise. Which raises the question, have you upgraded to the late style vac pump yet?
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  #7  
Old 09-22-2008, 09:38 PM
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The lifters are best characterized as "ticking".

They can be very pronounced if you listen at the back of the wheel wells.

Sometimes synthetic oil (Mobil 1) can clear it up over 10K miles or so.

Sometimes not..........
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  #8  
Old 09-23-2008, 12:49 AM
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8k miles of M1 fixed all but two of mine. 15 years of being driven by a little old lady (my grandma ) must have gunked those two up beyond the magic of M1. You should have seen the ALDA fitting on the manifold before I first cleaned it out

It was on the project list to replace them this summer, but I never got motivated to buy the parts and before I knew it it was August and time to head back to school
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